Keyboard



FIG. 1 is a perspective view a keyboard showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

Broken lines shown in the drawings are for environment only, and form no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 